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For what it's worth, I installed a BMS catch can about a year ago. It gathers a couple tablespoons of oil between each oil change (~4'000 miles or 4 months). The last time I drained the catch can I noticed that the inside of the hose running to the BMS was coated with oil. The inside of the hose leaving the BMS was bone dry. So it would appear that the catch can is helping to some degree. I plan on dropping the intercooler during the next oil change to see if the intercooler is collecting any oil. Prior to the catch can, I did notice a small amount of oil would accumulate in the intercooler. And while the intercooler probably acts like a large catch can, oil in the intercooler reduces it efficiency.
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